Dural sinuses are large channels located between the layers of the dura mater, which is the outermost membrane covering the brain and spinal cord. These sinuses collect and drain blood from the brain and surrounding tissues, returning it to the venous system. The main dural sinuses include the superior sagittal sinus, transverse sinus, and sigmoid sinus. They play a crucial role in maintaining proper blood flow and pressure within the central nervous system. Dysfunction or blockage of these sinuses can lead to serious medical conditions, such as cerebral venous sinus thrombosis.